﻿using System;
using System.Web;
using System.Drawing;
using System.Security.Cryptography;
using System.Web.UI.WebControls;

namespace Simple.Common
{
    public class SimpleCheckCode
    {
        public static string CreateCode(int codeLength)
        {
            string so = "1,2,3,4,5,6,7,8,9,A,B,C,D,E,F,G,H,I,J,K,L,M,N,P,Q,R,S,T,U,V,W,X,Y,Z";
            string[] strArr = so.Split(',');
            string code = "";
            Random rand = new Random();
            for (int i = 0; i < codeLength; i++)
            {
                code += strArr[rand.Next(0, strArr.Length)];
            }
            return code;
        }

        /*产生验证图片*/
        public static void CreateImage(string code)
        {

            Bitmap image = new Bitmap(100, 39);
            Graphics g = Graphics.FromImage(image);
            g.Clear(Color.White);
          //  WebColorConverter ww = new WebColorConverter();
           // g.Clear((Color)ww.ConvertFromString("#EAFEDE"));

            Random random = new Random();
            //画图片的背景噪音线
            //for (int i = 0; i < 12; i++)
            //{
            //    int x1 = random.Next(image.Width);
            //    int x2 = random.Next(image.Width);
            //    int y1 = random.Next(image.Height);
            //    int y2 = random.Next(image.Height);

            //    g.DrawLine(new Pen(Color.LightGray), x1, y1, x2, y2);
            //}
            Font font = new Font("Microsoft YaHei", 18, FontStyle.Bold);
            Brush b = new SolidBrush(Color.Black);
           // System.Drawing.Drawing2D.LinearGradientBrush brush = new System.Drawing.Drawing2D.LinearGradientBrush(new Rectangle(0, 0, image.Width, image.Height), Color.Black, Color.Black, 1.2f,true);
            g.DrawString(code, font, b,3, 3);

            //画图片的前景噪音点
            //for (int i = 0; i < 10; i++)
            //{
            //    int x = random.Next(image.Width);
            //    int y = random.Next(image.Height);
            //    image.SetPixel(x, y, Color.White);
            //}

            //画图片的边框线
            //g.DrawRectangle(new Pen(Color.FromArgb(234, 234, 234)), 0, 0, image.Width - 1, image.Height - 1);

            System.IO.MemoryStream ms = new System.IO.MemoryStream();
            image.Save(ms, System.Drawing.Imaging.ImageFormat.Gif);
            HttpContext.Current.Response.ClearContent();
            HttpContext.Current.Response.ContentType = "image/Gif";
            HttpContext.Current.Response.BinaryWrite(ms.ToArray());
            g.Dispose();
            image.Dispose();
        }
    }
}